score = eval(input(''))
if score >= 60:
    print('')

score = eval(input('请输入成绩分数：'))
if score < 60:
    print()
if score <= score <80:
    print()
if 80 <= score <= 90:
    print()
if 90 < score <= 100:
    print()

score = eval(input())
if 60 <= score:
    print()
    if 90 < score <= 100:
        print()

a = 10
if a > 20:
    print("变量a大于20")
else:
    print("变量a不大于20")

a = eval(input("请输入成绩"))
if a >= 60:
    print("成绩及格")
    if a >= 90:
        print("成绩很好")
    else:
        print("成绩一般")

a = eval(input("请输入成绩"))
if a >= 60:
    print("成绩及格")
    if a >= 90:
        print("成绩很好")
    else:
        print("成绩一般")
else:
    print("成绩不及格")
    if a > 30:
        print("成绩极差")
    else:
        print("成绩较差")

a = eval(input("请输入一个成绩分数"))
if a >= 90:
    print("成绩优秀")
elif a >= 80:
    print("成绩良好")
elif a >= 70:
    print("成绩中等")
elif a >= 60:
    print("成绩较好")
else:
    print("成绩不合格")

a = 1
while a <= 100:
    print("今天是第%d天"% a)
    a = a + 1

n = 1
sum = 0
while n <= 100:
    sum = sum+n
    n = n + 1
    print(sum)
print(sum)

for i in"python":
    print(i)

for i in range(10):
    print(i)
    print()


i = 1
while i <= 5:
    print("上班星期为：",i)
    i = i+1
    t = 9
    while t <= 17:
        print("时间段为：",t,end=" ")
        t = t+1
    print()

for i in range(1,6):
    print("上班为周：",i)
    for t in range(9,18):
        print("时间段为：",end=" ")
    print()

i = 1
while i <= 9:
    j = 1
    while j <= i:
        print("%d*%d=%d" % (j,i,j*i),end=" ")
        j = j+1
    print()
    i = i+1

for i in range(1,10):
    for j in range(1,i+1):
        print("%d*%d=%d" % (j,i,j*i),end=" ")
    print()

i = 0
while i <= 5:
    i += 1
    print("星期为：", i)
    if i == 3:
        break

i = 1
while i <= 5:
    if i == 3:
        break
    print("星期为：", i)
    i += 1

for i in range(1, 6):
    if i == 3:
        break
    print("星期为：", i)

for i in range(1, 6):
    print("星期为：", i)
    if i == 3:
        break

i = 0
while i < 5:
    i = i + 1
    if i == 4:
        continue
    print("星期为：", i)

for i in range(1, 6):
    if i == 4:
        continue
    print("星期为：", i)